[Kernel] Remove code from the old type propagation.

pkg/kernel/test/uint31_pair_map_bench.dart

Index: pkg/kernel/test/uint31_pair_map_bench.dart
diff --git a/pkg/kernel/test/uint31_pair_map_bench.dart b/pkg/kernel/test/uint31_pair_map_bench.dart
deleted file mode 100644
index 9f732a375dc69adf087dfbca3a69eb99df1b0b7a..0000000000000000000000000000000000000000
--- a/pkg/kernel/test/uint31_pair_map_bench.dart
+++ /dev/null
@@ -1,64 +0,0 @@
-import 'package:kernel/type_propagation/canonicalizer.dart';
-
-main() {
-  Stopwatch watch = new Stopwatch()..start();
-
-  const int lowBiasKeys = 100;
-  const int highBiasKeys = 10000;
-  const int noBiasKeys = 1000;
-
-  Uint31PairMap map;
-
-  // Warm up.
-  map = new Uint31PairMap();
-  for (int i = 0; i < noBiasKeys; ++i) {
-    for (int j = 0; j < noBiasKeys; ++j) {
-      map.lookup(i, j);
-      map.put(i + j);
-    }
-  }
-
-  // Even distributed tuple components.
-  watch.reset();
-  map = new Uint31PairMap();
-  for (int i = 0; i < noBiasKeys; ++i) {
-    for (int j = 0; j < noBiasKeys; ++j) {
-      map.lookup(i, j);
-      map.put(i + j);
-    }
-  }
-  int noBiasTime = watch.elapsedMicroseconds;
-
-  // Left-bias: more unique keys in the first component.
-  watch.reset();
-  map = new Uint31PairMap();
-  for (int i = 0; i < highBiasKeys; ++i) {
-    for (int j = 0; j < lowBiasKeys; ++j) {
-      map.lookup(i, j);
-      map.put(i + j);
-    }
-  }
-  int leftBiasTime = watch.elapsedMicroseconds;
-
-  // Right-bias: more unique keys in the second component.
-  watch.reset();
-  map = new Uint31PairMap();
-  for (int i = 0; i < lowBiasKeys; ++i) {
-    for (int j = 0; j < highBiasKeys; ++j) {
-      map.lookup(i, j);
-      map.put(i + j);
-    }
-  }
-  int rightBiasTime = watch.elapsedMicroseconds;
-
-  print('''
-bias.none:  ${formatTime(noBiasTime)}
-bias.left:  ${formatTime(leftBiasTime)}
-bias.right: ${formatTime(rightBiasTime)}
-''');
-}
-
-String formatTime(int microseconds) {
-  double seconds = microseconds / 1000000.0;
-  return '$seconds s';
-}